One is that he cares about antisemitism.
The other is that Israel didn't care about antisemitism until Netanyahu "weaponized" it against groups like Human Rights Watch.
Now, let's look at the actual article that Roth linked to, by David M. Weinberg. Here's what he says about Israel's attitude towards disapora antisemitism in its early days:
The State of Israel has not always seen the struggle against global anti-Semitism as its fight. For the first 25 years of Israel’s existence, the unspoken attitude in Jerusalem was that if Jews abroad had a problem with anti-Semites, they could always immigrate to Israel. Immersed in the business of building and defending the Jewish state, Israel’s leaders had no time for “troubles of the Diaspora.”Israel had to worry about its survival in its early days, it didn't have the luxury of protecting the world Jewish community. The despicable Roth twists that into saying that Israel didn't give a damn about antisemitism until it could selfishly conflate it with anti-Zionism.
Attitudes began to change after the Yom Kippur War. The campaign of political delegitimization against Israel launched by Arab countries led to the infamous 1975 “Zionism is Racism” resolution at the United Nations, alongside an avalanche of propaganda that blended anti-Semitism with anti-Zionism. Israel began to take notice. But still the prevailing attitude in Jerusalem was that anti-Semitism was a Diaspora problem for Diaspora Jews and their host countries.
However, after the 1980 Rue Copernic synagogue bombing in Paris and other terror attacks, then-Prime Minister Menachem Begin took the decision to have Israeli intelligence officials begin advising Jewish communities abroad on security measures. Response to global anti-Semitism thus found a concrete place on Israel’s national agenda.
The article explains quite well how anti-Zionism and antisemitism were conflated for as long as Israel existed, but especially with the "Zionism is Racism" resolution at the UN and through the infamous 2001 Durban conference of which HRW was an enthusiastic participant even as the US withdrew because of its antisemitism.
Weinberg notes:
Israel also has sought to dialogue with the international human rights community on these matters. But groups such as Amnesty International, Human Rights Watch and the World Council of Churches have studiously ignored the IHRA framework or rejected its definitions. In fact, they frequently stray into anti-Semitic territory in their incessant and fierce criticism of Israel. They also have consciously ignored the vast amounts of anti-Semitic materials emanating from Arab and Islamic countries.This is an understatement. Roth has ignored left-wing antisemitism, urban US antisemitism as well as Arab antisemitism.
Since Roth only recognizes right-wing antisemitism, and ignored the rest, it shows that he doesn't care about antisemitism. He is the one who weaponizes antisemitism against his political enemies, not Israel.
Notice also that Roth chose to illustrate the tweet with a photo of Bibi at AIPAC, the "Jewish lobby." His subtext was not lost on his own antisemitic followers, some of whom tweeted back their own antisemitism with no pushback from Roth.
This tweet shows how incredibly dishonest and beneath contempt Ken Roth is, as he uses the mantle of "human rights" to promote his own antisemitic agenda.